I've started to get a bit of a weird problem with my SDi that I can't get to the bottom of. Basically, when being a bit generous with the accelerator pedal the car will attempt to stall. There's a bit of a bang and the car lurches forwards before picking up again and acting like nothing happened. Also, at times when starting the car whilst warm (after waiting for the glow plug light to go off), it will cut out instantly. This feels very similar to when starting the car with a key that